Alert archive / Texas / Flash Flood Warnings in 1997

Flash Flood Warning 12, NWS Houston/Galveston, TX

February 20, 1997Liberty County, Polk County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Feb 20, 1997, 6:35 PM CST for Liberty County, Polk County, Texas. It was in force for 115 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Feb 20, 1997, 6:35 PM CST (00:35 UTC)
Expired
Feb 20, 1997, 8:30 PM CST
In force
115 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

Counties Liberty County, TX, Polk County, TX

The radar

The Houston radar (KHGX), 114 km from the middle of the area, began a volume at 00:34 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.6 hours before the alert went out and 160 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 1997-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 873 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 1997-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 286 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
873 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
530 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
286 m²/s²
0-3 km storm-relative helicity
305 m²/s²
Significant tornado parameter
1.1
Supercell composite
6.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KHOU 210034
FFWHOU
TXC291-373-210230-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
635 PM CST THU FEB 20 1997
 
THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  830 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST TEXAS
 
   ...LIBERTY COUNTY...POLK COUNTY
 
AT 635 PM...RADAR INDICATED A LINE OF STRONG THUNDERSTORMS FROM CORRIGAN
TO DAYTON MOVING EAST NEAR 15 MPH. THESE STORMS WILL PRODUCE RAINFALL
RATES UP TO 2 INCHES PER HOUR.
 
SHERIFF AND SPOTTER REPORTS INDICATE 3 TO 4 INCHES OF WATER COVERING
FM 2457 NEAR BLANCHARD IN POLK COUNTY.  ADDITIONAL RAINFALL WILL FURTHER
COMPLICATE STREET FLOODING AND FLOODING OF LOW LYING AREAS.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO
RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH
FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD
WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER
BEGINS RISING.
 
 
 
&

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this flash flood warning went out at Feb 20, 3:21 PM CST, 3 hours 14 minutes earlier.

Area forecast discussion, Feb 20, 3:21 PM CST, 3 hours 14 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
321 PM CST THU FEB 20 1997

500 MB LOW PLACEMENT INITIALIZED WELL WITH THE 160 KM ETA.  THE MDL
PLACES THE LOW OVR THE HILL COUNTRY BY 00Z...AND SATL LOOPS HAVE
CONFIRMED THIS MOVEMENT.  AS THE LOW BEGINS TO KICK OUT TWD THE RED
RIVER VALLEY THIS EVE...CAN XPC TSTMS TO MOVE E OF THE FCST AREA.
THE STMS SHUD BE E OF OR ALONG AN IAH TO GLS LINE BY 02Z THEN E OF
THE FCST AREA WELL BEFORE MIDNIGHT.  NEED TO CONT THE FLASH FLOOD
WATCH OVR SETX FOR EARLY THIS EVE...CAN DROP COUNTIES AS NEEDED.
WNDS IN ADV CAT ON THE BACKSIDE OF THE LOW SHUD AFFECT THE FCST AREA
FRI.  CDFNT MOVS THRU SETX FM THE N FRI AND MINS FRI NGT MAY GET INTO
THE 30S.  SEE PRELIMS FOR TEMP AND POP INFO.  40

PRELIMS...
CLL E/B B/B 53/66 39/57 4--- (CHC OF RWS OR TSTMS THIS EVE EARLY)
IAH T/E B/B 59/70 40/58 61-- (TSTMS ENDING THIS EVE)
GLS T/B E/B 60/68 44/56 61-- (TSTMS ENDING THIS EVE)

In the hours before

Special weather statement, Feb 20, 2:58 PM CST, 3 hours 37 minutes before
TXZ176>179-195>200-210>214-226-227-235>238-511-513-163-164-210300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
258 PM CST THU FEB 20 1997

THE NATIONAL WEATHER SERVICE HAS ISSUED ANOTHER TORNADO WATCH FOR
SOUTHEAST TEXAS NOW IN EFFECT UNTIL 9 PM.  THIS WATCH REPLACES THE
PREVIOUS TWO WATCHES PREVIOUSLY IN EFFECT UNTIL 5 PM. COUNTIES
INCLUDED IN THE WATCH AREA INCLUDE:
AUSTIN...BRAZORIA...BRAZOS...BURLESON...CHAMBERS...COLORADO...FORT
BEND...GALVESTON...GRIMES...HARRIS...HOUSTON...JACKSON...LIBERTY...
MADISON...MATAGORDA...MONTGOMERY...POLK...SAN JACINTO...TRINITY...
WALKER...WALLER...WASHINGTON...AND WHARTON COUNTIES INCLUDING THE
ADJACENT COASTAL WATERS. THE WATCH ALSO INCLUDES LEON AND
ROBERTSON COUNTIES IN CENTRAL TEXAS.

REMEMBER A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WEATHER AND TORNADOES TO FORM IN AND NEAR THE WATCH AREA.  PEOPLE IN
THE WATCH AREA ARE URGED TO MONITOR THE LATEST WEATHER CONDITIONS
AND BE PREPARED TO SEEK SHELTER SHOULD SEVERE WEATHER THREATEN THE
AREA.

A FLASH FLOOD WATCH ALSO REMAINS IN EFFECT FOR ALL OF SOUTHEAST TEXAS.

STAY TUNED TO NOAA WEATHER RADIO...RADIO OR TELEVISION FOR THE
LATEST UPDATES CONCERNING THIS DEVELOPING WEATHER SITUATION.

Nearby

Flash Flood Warnings in Texas, 1997Every flash flood warning in 1997

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.